138704185 has 8 divisors (see below), whose sum is σ = 167094216. Its totient is φ = 110530560.

The previous prime is 138704183. The next prime is 138704213. The reversal of 138704185 is 581407831.

It can be written as a sum of positive squares in 4 ways, for example, as 75533481 + 63170704 = 8691^2 + 7948^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138704185 - 2¹ = 138704183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138704183) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52686 + ... + 55255.

It is an arithmetic number, because the mean of its divisors is an integer number (20886777).

Almost surely, 2^138704185 is an apocalyptic number.

It is an amenable number.

138704185 is a deficient number, since it is larger than the sum of its proper divisors (28390031).

138704185 is a wasteful number, since it uses less digits than its factorization.

138704185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108203.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 138704185 is about 11777.2740903827. The cubic root of 138704185 is about 517.6424153147.

The spelling of 138704185 in words is "one hundred thirty-eight million, seven hundred four thousand, one hundred eighty-five".